stash: remove now superfluos help for "stash push"
[git.git] / fsck.c
blob032699e9ac2622c7d089523a456db0fa83310e14
1 #include "cache.h"
2 #include "object.h"
3 #include "blob.h"
4 #include "tree.h"
5 #include "tree-walk.h"
6 #include "commit.h"
7 #include "tag.h"
8 #include "fsck.h"
9 #include "refs.h"
10 #include "utf8.h"
11 #include "sha1-array.h"
12 #include "decorate.h"
14 #define FSCK_FATAL -1
15 #define FSCK_INFO -2
17 #define FOREACH_MSG_ID(FUNC) \
18         /* fatal errors */ \
19         FUNC(NUL_IN_HEADER, FATAL) \
20         FUNC(UNTERMINATED_HEADER, FATAL) \
21         /* errors */ \
22         FUNC(BAD_DATE, ERROR) \
23         FUNC(BAD_DATE_OVERFLOW, ERROR) \
24         FUNC(BAD_EMAIL, ERROR) \
25         FUNC(BAD_NAME, ERROR) \
26         FUNC(BAD_OBJECT_SHA1, ERROR) \
27         FUNC(BAD_PARENT_SHA1, ERROR) \
28         FUNC(BAD_TAG_OBJECT, ERROR) \
29         FUNC(BAD_TIMEZONE, ERROR) \
30         FUNC(BAD_TREE, ERROR) \
31         FUNC(BAD_TREE_SHA1, ERROR) \
32         FUNC(BAD_TYPE, ERROR) \
33         FUNC(DUPLICATE_ENTRIES, ERROR) \
34         FUNC(MISSING_AUTHOR, ERROR) \
35         FUNC(MISSING_COMMITTER, ERROR) \
36         FUNC(MISSING_EMAIL, ERROR) \
37         FUNC(MISSING_GRAFT, ERROR) \
38         FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
39         FUNC(MISSING_OBJECT, ERROR) \
40         FUNC(MISSING_PARENT, ERROR) \
41         FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
42         FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
43         FUNC(MISSING_TAG, ERROR) \
44         FUNC(MISSING_TAG_ENTRY, ERROR) \
45         FUNC(MISSING_TAG_OBJECT, ERROR) \
46         FUNC(MISSING_TREE, ERROR) \
47         FUNC(MISSING_TYPE, ERROR) \
48         FUNC(MISSING_TYPE_ENTRY, ERROR) \
49         FUNC(MULTIPLE_AUTHORS, ERROR) \
50         FUNC(TAG_OBJECT_NOT_TAG, ERROR) \
51         FUNC(TREE_NOT_SORTED, ERROR) \
52         FUNC(UNKNOWN_TYPE, ERROR) \
53         FUNC(ZERO_PADDED_DATE, ERROR) \
54         /* warnings */ \
55         FUNC(BAD_FILEMODE, WARN) \
56         FUNC(EMPTY_NAME, WARN) \
57         FUNC(FULL_PATHNAME, WARN) \
58         FUNC(HAS_DOT, WARN) \
59         FUNC(HAS_DOTDOT, WARN) \
60         FUNC(HAS_DOTGIT, WARN) \
61         FUNC(NULL_SHA1, WARN) \
62         FUNC(ZERO_PADDED_FILEMODE, WARN) \
63         FUNC(NUL_IN_COMMIT, WARN) \
64         /* infos (reported as warnings, but ignored by default) */ \
65         FUNC(BAD_TAG_NAME, INFO) \
66         FUNC(MISSING_TAGGER_ENTRY, INFO)
68 #define MSG_ID(id, msg_type) FSCK_MSG_##id,
69 enum fsck_msg_id {
70         FOREACH_MSG_ID(MSG_ID)
71         FSCK_MSG_MAX
73 #undef MSG_ID
75 #define STR(x) #x
76 #define MSG_ID(id, msg_type) { STR(id), NULL, FSCK_##msg_type },
77 static struct {
78         const char *id_string;
79         const char *downcased;
80         int msg_type;
81 } msg_id_info[FSCK_MSG_MAX + 1] = {
82         FOREACH_MSG_ID(MSG_ID)
83         { NULL, NULL, -1 }
85 #undef MSG_ID
87 static int parse_msg_id(const char *text)
89         int i;
91         if (!msg_id_info[0].downcased) {
92                 /* convert id_string to lower case, without underscores. */
93                 for (i = 0; i < FSCK_MSG_MAX; i++) {
94                         const char *p = msg_id_info[i].id_string;
95                         int len = strlen(p);
96                         char *q = xmalloc(len);
98                         msg_id_info[i].downcased = q;
99                         while (*p)
100                                 if (*p == '_')
101                                         p++;
102                                 else
103                                         *(q)++ = tolower(*(p)++);
104                         *q = '\0';
105                 }
106         }
108         for (i = 0; i < FSCK_MSG_MAX; i++)
109                 if (!strcmp(text, msg_id_info[i].downcased))
110                         return i;
112         return -1;
115 static int fsck_msg_type(enum fsck_msg_id msg_id,
116         struct fsck_options *options)
118         int msg_type;
120         assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
122         if (options->msg_type)
123                 msg_type = options->msg_type[msg_id];
124         else {
125                 msg_type = msg_id_info[msg_id].msg_type;
126                 if (options->strict && msg_type == FSCK_WARN)
127                         msg_type = FSCK_ERROR;
128         }
130         return msg_type;
133 static void init_skiplist(struct fsck_options *options, const char *path)
135         static struct oid_array skiplist = OID_ARRAY_INIT;
136         int sorted, fd;
137         char buffer[GIT_MAX_HEXSZ + 1];
138         struct object_id oid;
140         if (options->skiplist)
141                 sorted = options->skiplist->sorted;
142         else {
143                 sorted = 1;
144                 options->skiplist = &skiplist;
145         }
147         fd = open(path, O_RDONLY);
148         if (fd < 0)
149                 die("Could not open skip list: %s", path);
150         for (;;) {
151                 const char *p;
152                 int result = read_in_full(fd, buffer, sizeof(buffer));
153                 if (result < 0)
154                         die_errno("Could not read '%s'", path);
155                 if (!result)
156                         break;
157                 if (parse_oid_hex(buffer, &oid, &p) || *p != '\n')
158                         die("Invalid SHA-1: %s", buffer);
159                 oid_array_append(&skiplist, &oid);
160                 if (sorted && skiplist.nr > 1 &&
161                                 oidcmp(&skiplist.oid[skiplist.nr - 2],
162                                        &oid) > 0)
163                         sorted = 0;
164         }
165         close(fd);
167         if (sorted)
168                 skiplist.sorted = 1;
171 static int parse_msg_type(const char *str)
173         if (!strcmp(str, "error"))
174                 return FSCK_ERROR;
175         else if (!strcmp(str, "warn"))
176                 return FSCK_WARN;
177         else if (!strcmp(str, "ignore"))
178                 return FSCK_IGNORE;
179         else
180                 die("Unknown fsck message type: '%s'", str);
183 int is_valid_msg_type(const char *msg_id, const char *msg_type)
185         if (parse_msg_id(msg_id) < 0)
186                 return 0;
187         parse_msg_type(msg_type);
188         return 1;
191 void fsck_set_msg_type(struct fsck_options *options,
192                 const char *msg_id, const char *msg_type)
194         int id = parse_msg_id(msg_id), type;
196         if (id < 0)
197                 die("Unhandled message id: %s", msg_id);
198         type = parse_msg_type(msg_type);
200         if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
201                 die("Cannot demote %s to %s", msg_id, msg_type);
203         if (!options->msg_type) {
204                 int i;
205                 int *msg_type;
206                 ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
207                 for (i = 0; i < FSCK_MSG_MAX; i++)
208                         msg_type[i] = fsck_msg_type(i, options);
209                 options->msg_type = msg_type;
210         }
212         options->msg_type[id] = type;
215 void fsck_set_msg_types(struct fsck_options *options, const char *values)
217         char *buf = xstrdup(values), *to_free = buf;
218         int done = 0;
220         while (!done) {
221                 int len = strcspn(buf, " ,|"), equal;
223                 done = !buf[len];
224                 if (!len) {
225                         buf++;
226                         continue;
227                 }
228                 buf[len] = '\0';
230                 for (equal = 0;
231                      equal < len && buf[equal] != '=' && buf[equal] != ':';
232                      equal++)
233                         buf[equal] = tolower(buf[equal]);
234                 buf[equal] = '\0';
236                 if (!strcmp(buf, "skiplist")) {
237                         if (equal == len)
238                                 die("skiplist requires a path");
239                         init_skiplist(options, buf + equal + 1);
240                         buf += len + 1;
241                         continue;
242                 }
244                 if (equal == len)
245                         die("Missing '=': '%s'", buf);
247                 fsck_set_msg_type(options, buf, buf + equal + 1);
248                 buf += len + 1;
249         }
250         free(to_free);
253 static void append_msg_id(struct strbuf *sb, const char *msg_id)
255         for (;;) {
256                 char c = *(msg_id)++;
258                 if (!c)
259                         break;
260                 if (c != '_')
261                         strbuf_addch(sb, tolower(c));
262                 else {
263                         assert(*msg_id);
264                         strbuf_addch(sb, *(msg_id)++);
265                 }
266         }
268         strbuf_addstr(sb, ": ");
271 __attribute__((format (printf, 4, 5)))
272 static int report(struct fsck_options *options, struct object *object,
273         enum fsck_msg_id id, const char *fmt, ...)
275         va_list ap;
276         struct strbuf sb = STRBUF_INIT;
277         int msg_type = fsck_msg_type(id, options), result;
279         if (msg_type == FSCK_IGNORE)
280                 return 0;
282         if (options->skiplist && object &&
283                         oid_array_lookup(options->skiplist, &object->oid) >= 0)
284                 return 0;
286         if (msg_type == FSCK_FATAL)
287                 msg_type = FSCK_ERROR;
288         else if (msg_type == FSCK_INFO)
289                 msg_type = FSCK_WARN;
291         append_msg_id(&sb, msg_id_info[id].id_string);
293         va_start(ap, fmt);
294         strbuf_vaddf(&sb, fmt, ap);
295         result = options->error_func(options, object, msg_type, sb.buf);
296         strbuf_release(&sb);
297         va_end(ap);
299         return result;
302 static char *get_object_name(struct fsck_options *options, struct object *obj)
304         if (!options->object_names)
305                 return NULL;
306         return lookup_decoration(options->object_names, obj);
309 static void put_object_name(struct fsck_options *options, struct object *obj,
310         const char *fmt, ...)
312         va_list ap;
313         struct strbuf buf = STRBUF_INIT;
314         char *existing;
316         if (!options->object_names)
317                 return;
318         existing = lookup_decoration(options->object_names, obj);
319         if (existing)
320                 return;
321         va_start(ap, fmt);
322         strbuf_vaddf(&buf, fmt, ap);
323         add_decoration(options->object_names, obj, strbuf_detach(&buf, NULL));
324         va_end(ap);
327 static const char *describe_object(struct fsck_options *o, struct object *obj)
329         static struct strbuf buf = STRBUF_INIT;
330         char *name;
332         strbuf_reset(&buf);
333         strbuf_addstr(&buf, oid_to_hex(&obj->oid));
334         if (o->object_names && (name = lookup_decoration(o->object_names, obj)))
335                 strbuf_addf(&buf, " (%s)", name);
337         return buf.buf;
340 static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
342         struct tree_desc desc;
343         struct name_entry entry;
344         int res = 0;
345         const char *name;
347         if (parse_tree(tree))
348                 return -1;
350         name = get_object_name(options, &tree->object);
351         if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
352                 return -1;
353         while (tree_entry_gently(&desc, &entry)) {
354                 struct object *obj;
355                 int result;
357                 if (S_ISGITLINK(entry.mode))
358                         continue;
360                 if (S_ISDIR(entry.mode)) {
361                         obj = (struct object *)lookup_tree(entry.oid);
362                         if (name && obj)
363                                 put_object_name(options, obj, "%s%s/", name,
364                                         entry.path);
365                         result = options->walk(obj, OBJ_TREE, data, options);
366                 }
367                 else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
368                         obj = (struct object *)lookup_blob(entry.oid);
369                         if (name && obj)
370                                 put_object_name(options, obj, "%s%s", name,
371                                         entry.path);
372                         result = options->walk(obj, OBJ_BLOB, data, options);
373                 }
374                 else {
375                         result = error("in tree %s: entry %s has bad mode %.6o",
376                                         describe_object(options, &tree->object), entry.path, entry.mode);
377                 }
378                 if (result < 0)
379                         return result;
380                 if (!res)
381                         res = result;
382         }
383         return res;
386 static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
388         int counter = 0, generation = 0, name_prefix_len = 0;
389         struct commit_list *parents;
390         int res;
391         int result;
392         const char *name;
394         if (parse_commit(commit))
395                 return -1;
397         name = get_object_name(options, &commit->object);
398         if (name)
399                 put_object_name(options, &commit->tree->object, "%s:", name);
401         result = options->walk((struct object *)commit->tree, OBJ_TREE, data, options);
402         if (result < 0)
403                 return result;
404         res = result;
406         parents = commit->parents;
407         if (name && parents) {
408                 int len = strlen(name), power;
410                 if (len && name[len - 1] == '^') {
411                         generation = 1;
412                         name_prefix_len = len - 1;
413                 }
414                 else { /* parse ~<generation> suffix */
415                         for (generation = 0, power = 1;
416                              len && isdigit(name[len - 1]);
417                              power *= 10)
418                                 generation += power * (name[--len] - '0');
419                         if (power > 1 && len && name[len - 1] == '~')
420                                 name_prefix_len = len - 1;
421                 }
422         }
424         while (parents) {
425                 if (name) {
426                         struct object *obj = &parents->item->object;
428                         if (++counter > 1)
429                                 put_object_name(options, obj, "%s^%d",
430                                         name, counter);
431                         else if (generation > 0)
432                                 put_object_name(options, obj, "%.*s~%d",
433                                         name_prefix_len, name, generation + 1);
434                         else
435                                 put_object_name(options, obj, "%s^", name);
436                 }
437                 result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
438                 if (result < 0)
439                         return result;
440                 if (!res)
441                         res = result;
442                 parents = parents->next;
443         }
444         return res;
447 static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
449         char *name = get_object_name(options, &tag->object);
451         if (parse_tag(tag))
452                 return -1;
453         if (name)
454                 put_object_name(options, tag->tagged, "%s", name);
455         return options->walk(tag->tagged, OBJ_ANY, data, options);
458 int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
460         if (!obj)
461                 return -1;
463         if (obj->type == OBJ_NONE)
464                 parse_object(&obj->oid);
466         switch (obj->type) {
467         case OBJ_BLOB:
468                 return 0;
469         case OBJ_TREE:
470                 return fsck_walk_tree((struct tree *)obj, data, options);
471         case OBJ_COMMIT:
472                 return fsck_walk_commit((struct commit *)obj, data, options);
473         case OBJ_TAG:
474                 return fsck_walk_tag((struct tag *)obj, data, options);
475         default:
476                 error("Unknown object type for %s", describe_object(options, obj));
477                 return -1;
478         }
482  * The entries in a tree are ordered in the _path_ order,
483  * which means that a directory entry is ordered by adding
484  * a slash to the end of it.
486  * So a directory called "a" is ordered _after_ a file
487  * called "a.c", because "a/" sorts after "a.c".
488  */
489 #define TREE_UNORDERED (-1)
490 #define TREE_HAS_DUPS  (-2)
492 static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
494         int len1 = strlen(name1);
495         int len2 = strlen(name2);
496         int len = len1 < len2 ? len1 : len2;
497         unsigned char c1, c2;
498         int cmp;
500         cmp = memcmp(name1, name2, len);
501         if (cmp < 0)
502                 return 0;
503         if (cmp > 0)
504                 return TREE_UNORDERED;
506         /*
507          * Ok, the first <len> characters are the same.
508          * Now we need to order the next one, but turn
509          * a '\0' into a '/' for a directory entry.
510          */
511         c1 = name1[len];
512         c2 = name2[len];
513         if (!c1 && !c2)
514                 /*
515                  * git-write-tree used to write out a nonsense tree that has
516                  * entries with the same name, one blob and one tree.  Make
517                  * sure we do not have duplicate entries.
518                  */
519                 return TREE_HAS_DUPS;
520         if (!c1 && S_ISDIR(mode1))
521                 c1 = '/';
522         if (!c2 && S_ISDIR(mode2))
523                 c2 = '/';
524         return c1 < c2 ? 0 : TREE_UNORDERED;
527 static int fsck_tree(struct tree *item, struct fsck_options *options)
529         int retval = 0;
530         int has_null_sha1 = 0;
531         int has_full_path = 0;
532         int has_empty_name = 0;
533         int has_dot = 0;
534         int has_dotdot = 0;
535         int has_dotgit = 0;
536         int has_zero_pad = 0;
537         int has_bad_modes = 0;
538         int has_dup_entries = 0;
539         int not_properly_sorted = 0;
540         struct tree_desc desc;
541         unsigned o_mode;
542         const char *o_name;
544         if (init_tree_desc_gently(&desc, item->buffer, item->size)) {
545                 retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
546                 return retval;
547         }
549         o_mode = 0;
550         o_name = NULL;
552         while (desc.size) {
553                 unsigned mode;
554                 const char *name;
555                 const struct object_id *oid;
557                 oid = tree_entry_extract(&desc, &name, &mode);
559                 has_null_sha1 |= is_null_oid(oid);
560                 has_full_path |= !!strchr(name, '/');
561                 has_empty_name |= !*name;
562                 has_dot |= !strcmp(name, ".");
563                 has_dotdot |= !strcmp(name, "..");
564                 has_dotgit |= (!strcmp(name, ".git") ||
565                                is_hfs_dotgit(name) ||
566                                is_ntfs_dotgit(name));
567                 has_zero_pad |= *(char *)desc.buffer == '0';
568                 if (update_tree_entry_gently(&desc)) {
569                         retval += report(options, &item->object, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
570                         break;
571                 }
573                 switch (mode) {
574                 /*
575                  * Standard modes..
576                  */
577                 case S_IFREG | 0755:
578                 case S_IFREG | 0644:
579                 case S_IFLNK:
580                 case S_IFDIR:
581                 case S_IFGITLINK:
582                         break;
583                 /*
584                  * This is nonstandard, but we had a few of these
585                  * early on when we honored the full set of mode
586                  * bits..
587                  */
588                 case S_IFREG | 0664:
589                         if (!options->strict)
590                                 break;
591                         /* fallthrough */
592                 default:
593                         has_bad_modes = 1;
594                 }
596                 if (o_name) {
597                         switch (verify_ordered(o_mode, o_name, mode, name)) {
598                         case TREE_UNORDERED:
599                                 not_properly_sorted = 1;
600                                 break;
601                         case TREE_HAS_DUPS:
602                                 has_dup_entries = 1;
603                                 break;
604                         default:
605                                 break;
606                         }
607                 }
609                 o_mode = mode;
610                 o_name = name;
611         }
613         if (has_null_sha1)
614                 retval += report(options, &item->object, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
615         if (has_full_path)
616                 retval += report(options, &item->object, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
617         if (has_empty_name)
618                 retval += report(options, &item->object, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
619         if (has_dot)
620                 retval += report(options, &item->object, FSCK_MSG_HAS_DOT, "contains '.'");
621         if (has_dotdot)
622                 retval += report(options, &item->object, FSCK_MSG_HAS_DOTDOT, "contains '..'");
623         if (has_dotgit)
624                 retval += report(options, &item->object, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
625         if (has_zero_pad)
626                 retval += report(options, &item->object, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
627         if (has_bad_modes)
628                 retval += report(options, &item->object, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
629         if (has_dup_entries)
630                 retval += report(options, &item->object, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
631         if (not_properly_sorted)
632                 retval += report(options, &item->object, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
633         return retval;
636 static int verify_headers(const void *data, unsigned long size,
637                           struct object *obj, struct fsck_options *options)
639         const char *buffer = (const char *)data;
640         unsigned long i;
642         for (i = 0; i < size; i++) {
643                 switch (buffer[i]) {
644                 case '\0':
645                         return report(options, obj,
646                                 FSCK_MSG_NUL_IN_HEADER,
647                                 "unterminated header: NUL at offset %ld", i);
648                 case '\n':
649                         if (i + 1 < size && buffer[i + 1] == '\n')
650                                 return 0;
651                 }
652         }
654         /*
655          * We did not find double-LF that separates the header
656          * and the body.  Not having a body is not a crime but
657          * we do want to see the terminating LF for the last header
658          * line.
659          */
660         if (size && buffer[size - 1] == '\n')
661                 return 0;
663         return report(options, obj,
664                 FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
667 static int fsck_ident(const char **ident, struct object *obj, struct fsck_options *options)
669         const char *p = *ident;
670         char *end;
672         *ident = strchrnul(*ident, '\n');
673         if (**ident == '\n')
674                 (*ident)++;
676         if (*p == '<')
677                 return report(options, obj, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
678         p += strcspn(p, "<>\n");
679         if (*p == '>')
680                 return report(options, obj, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
681         if (*p != '<')
682                 return report(options, obj, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
683         if (p[-1] != ' ')
684                 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
685         p++;
686         p += strcspn(p, "<>\n");
687         if (*p != '>')
688                 return report(options, obj, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
689         p++;
690         if (*p != ' ')
691                 return report(options, obj, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
692         p++;
693         if (*p == '0' && p[1] != ' ')
694                 return report(options, obj, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
695         if (date_overflows(parse_timestamp(p, &end, 10)))
696                 return report(options, obj, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
697         if ((end == p || *end != ' '))
698                 return report(options, obj, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
699         p = end + 1;
700         if ((*p != '+' && *p != '-') ||
701             !isdigit(p[1]) ||
702             !isdigit(p[2]) ||
703             !isdigit(p[3]) ||
704             !isdigit(p[4]) ||
705             (p[5] != '\n'))
706                 return report(options, obj, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
707         p += 6;
708         return 0;
711 static int fsck_commit_buffer(struct commit *commit, const char *buffer,
712         unsigned long size, struct fsck_options *options)
714         unsigned char tree_sha1[20], sha1[20];
715         struct commit_graft *graft;
716         unsigned parent_count, parent_line_count = 0, author_count;
717         int err;
718         const char *buffer_begin = buffer;
720         if (verify_headers(buffer, size, &commit->object, options))
721                 return -1;
723         if (!skip_prefix(buffer, "tree ", &buffer))
724                 return report(options, &commit->object, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
725         if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n') {
726                 err = report(options, &commit->object, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
727                 if (err)
728                         return err;
729         }
730         buffer += 41;
731         while (skip_prefix(buffer, "parent ", &buffer)) {
732                 if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
733                         err = report(options, &commit->object, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
734                         if (err)
735                                 return err;
736                 }
737                 buffer += 41;
738                 parent_line_count++;
739         }
740         graft = lookup_commit_graft(&commit->object.oid);
741         parent_count = commit_list_count(commit->parents);
742         if (graft) {
743                 if (graft->nr_parent == -1 && !parent_count)
744                         ; /* shallow commit */
745                 else if (graft->nr_parent != parent_count) {
746                         err = report(options, &commit->object, FSCK_MSG_MISSING_GRAFT, "graft objects missing");
747                         if (err)
748                                 return err;
749                 }
750         } else {
751                 if (parent_count != parent_line_count) {
752                         err = report(options, &commit->object, FSCK_MSG_MISSING_PARENT, "parent objects missing");
753                         if (err)
754                                 return err;
755                 }
756         }
757         author_count = 0;
758         while (skip_prefix(buffer, "author ", &buffer)) {
759                 author_count++;
760                 err = fsck_ident(&buffer, &commit->object, options);
761                 if (err)
762                         return err;
763         }
764         if (author_count < 1)
765                 err = report(options, &commit->object, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
766         else if (author_count > 1)
767                 err = report(options, &commit->object, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
768         if (err)
769                 return err;
770         if (!skip_prefix(buffer, "committer ", &buffer))
771                 return report(options, &commit->object, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
772         err = fsck_ident(&buffer, &commit->object, options);
773         if (err)
774                 return err;
775         if (!commit->tree) {
776                 err = report(options, &commit->object, FSCK_MSG_BAD_TREE, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
777                 if (err)
778                         return err;
779         }
780         if (memchr(buffer_begin, '\0', size)) {
781                 err = report(options, &commit->object, FSCK_MSG_NUL_IN_COMMIT,
782                              "NUL byte in the commit object body");
783                 if (err)
784                         return err;
785         }
786         return 0;
789 static int fsck_commit(struct commit *commit, const char *data,
790         unsigned long size, struct fsck_options *options)
792         const char *buffer = data ?  data : get_commit_buffer(commit, &size);
793         int ret = fsck_commit_buffer(commit, buffer, size, options);
794         if (!data)
795                 unuse_commit_buffer(commit, buffer);
796         return ret;
799 static int fsck_tag_buffer(struct tag *tag, const char *data,
800         unsigned long size, struct fsck_options *options)
802         unsigned char sha1[20];
803         int ret = 0;
804         const char *buffer;
805         char *to_free = NULL, *eol;
806         struct strbuf sb = STRBUF_INIT;
808         if (data)
809                 buffer = data;
810         else {
811                 enum object_type type;
813                 buffer = to_free =
814                         read_sha1_file(tag->object.oid.hash, &type, &size);
815                 if (!buffer)
816                         return report(options, &tag->object,
817                                 FSCK_MSG_MISSING_TAG_OBJECT,
818                                 "cannot read tag object");
820                 if (type != OBJ_TAG) {
821                         ret = report(options, &tag->object,
822                                 FSCK_MSG_TAG_OBJECT_NOT_TAG,
823                                 "expected tag got %s",
824                             typename(type));
825                         goto done;
826                 }
827         }
829         ret = verify_headers(buffer, size, &tag->object, options);
830         if (ret)
831                 goto done;
833         if (!skip_prefix(buffer, "object ", &buffer)) {
834                 ret = report(options, &tag->object, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
835                 goto done;
836         }
837         if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
838                 ret = report(options, &tag->object, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
839                 if (ret)
840                         goto done;
841         }
842         buffer += 41;
844         if (!skip_prefix(buffer, "type ", &buffer)) {
845                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
846                 goto done;
847         }
848         eol = strchr(buffer, '\n');
849         if (!eol) {
850                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
851                 goto done;
852         }
853         if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
854                 ret = report(options, &tag->object, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
855         if (ret)
856                 goto done;
857         buffer = eol + 1;
859         if (!skip_prefix(buffer, "tag ", &buffer)) {
860                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
861                 goto done;
862         }
863         eol = strchr(buffer, '\n');
864         if (!eol) {
865                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAG, "invalid format - unexpected end after 'type' line");
866                 goto done;
867         }
868         strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
869         if (check_refname_format(sb.buf, 0)) {
870                 ret = report(options, &tag->object, FSCK_MSG_BAD_TAG_NAME,
871                            "invalid 'tag' name: %.*s",
872                            (int)(eol - buffer), buffer);
873                 if (ret)
874                         goto done;
875         }
876         buffer = eol + 1;
878         if (!skip_prefix(buffer, "tagger ", &buffer)) {
879                 /* early tags do not contain 'tagger' lines; warn only */
880                 ret = report(options, &tag->object, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
881                 if (ret)
882                         goto done;
883         }
884         else
885                 ret = fsck_ident(&buffer, &tag->object, options);
887 done:
888         strbuf_release(&sb);
889         free(to_free);
890         return ret;
893 static int fsck_tag(struct tag *tag, const char *data,
894         unsigned long size, struct fsck_options *options)
896         struct object *tagged = tag->tagged;
898         if (!tagged)
899                 return report(options, &tag->object, FSCK_MSG_BAD_TAG_OBJECT, "could not load tagged object");
901         return fsck_tag_buffer(tag, data, size, options);
904 int fsck_object(struct object *obj, void *data, unsigned long size,
905         struct fsck_options *options)
907         if (!obj)
908                 return report(options, obj, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
910         if (obj->type == OBJ_BLOB)
911                 return 0;
912         if (obj->type == OBJ_TREE)
913                 return fsck_tree((struct tree *) obj, options);
914         if (obj->type == OBJ_COMMIT)
915                 return fsck_commit((struct commit *) obj, (const char *) data,
916                         size, options);
917         if (obj->type == OBJ_TAG)
918                 return fsck_tag((struct tag *) obj, (const char *) data,
919                         size, options);
921         return report(options, obj, FSCK_MSG_UNKNOWN_TYPE, "unknown type '%d' (internal fsck error)",
922                           obj->type);
925 int fsck_error_function(struct fsck_options *o,
926         struct object *obj, int msg_type, const char *message)
928         if (msg_type == FSCK_WARN) {
929                 warning("object %s: %s", describe_object(o, obj), message);
930                 return 0;
931         }
932         error("object %s: %s", describe_object(o, obj), message);
933         return 1;